From b8559dc242d1d47dcf99660a4d6afded727e0cc0 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Wed, 12 Oct 2016 19:28:29 +0800 Subject: f2fs: split free nid list During free nid allocation, in order to do preallocation, we will tag free nid entry as allocated one and still leave it in free nid list, for other allocators who want to grab free nids, it needs to traverse the free nid list for lookup. It becomes overhead in scenario of allocating free nid intensively by multithreads. This patch splits free nid list to two list: {free,alloc}_nid_list, to keep free nids and preallocated free nids separately, after that, traverse latency will be gone, besides split nid_cnt for separate statistic. Additionally, introduce __insert_nid_to_list and __remove_nid_from_list for cleanup. Signed-off-by: Chao Yu [Jaegeuk Kim: modify f2fs_bug_on to avoid needless branches] Signed-off-by: Jaegeuk Kim --- fs/f2fs/shrinker.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs/f2fs/shrinker.c') diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c index 46c915425923..ec539f407cc4 100644 --- a/fs/f2fs/shrinker.c +++ b/fs/f2fs/shrinker.c @@ -26,8 +26,8 @@ static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi) static unsigned long __count_free_nids(struct f2fs_sb_info *sbi) { - if (NM_I(sbi)->fcnt > MAX_FREE_NIDS) - return NM_I(sbi)->fcnt - MAX_FREE_NIDS; + if (NM_I(sbi)->nid_cnt[FREE_NID_LIST] > MAX_FREE_NIDS) + return NM_I(sbi)->nid_cnt[FREE_NID_LIST] - MAX_FREE_NIDS; return 0; } -- cgit v1.2.1